You have legal abilitys to strike/injure/kill him, if he attacks you, you have the LEGAL ability to grab a weapon and attack him. IF you do get taken to court, or questioned by the police, you just need to provide one simple statement "I was in fear of my life, I defended myself as he attacked me." Just incase, leave a note where someone can see it, if they searched the house, if you have any spare change, go to a pay phone and call the cops, and have him arrested, and if you have any marks, bruises, or any proof he has attacked you, he could befaceing some jail time, and being someones girlfriend for awhile.